U.S. patent number 3,720,913 [Application Number 05/156,888] was granted by the patent office on 1973-03-13 for warning and courtesy display system for motor vehicle operators.
Invention is credited to Richard H. Bradford.
United States Patent |
3,720,913 |
Bradford |
March 13, 1973 |
WARNING AND COURTESY DISPLAY SYSTEM FOR MOTOR VEHICLE OPERATORS
Abstract
A display for notifying a motorist that his headlights are not
on and/or for conveying other courtesy information comprises means
for sensing proximity of a vehicle, means for sensing ambient
light, and means for sensing illumination from the vehicle
headlights. When a vehicle is present under poor ambient light
conditions and headlight illumination is not sensed, a display
advises the motorist to turn headlights on. When illumination is
sensed, the display may change to a courtesy message.
Inventors: |
Bradford; Richard H.
(Kensington, MD) |
Family
ID: |
22561521 |
Appl.
No.: |
05/156,888 |
Filed: |
June 25, 1971 |
Current U.S.
Class: |
340/933;
340/928 |
Current CPC
Class: |
G08G
1/0962 (20130101) |
Current International
Class: |
G08G
1/09 (20060101); G08g 001/09 () |
Field of
Search: |
;340/22,31R,32,38R,38P,33 ;250/214D,217R
;40/52R,52B,129C,13R,13C,132R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Claffy; Kathleen H.
Assistant Examiner: Myers; Randall P.
Claims
I claim:
1. A display system for motor vehicles comprising a display device
disposed adjacent to the path of travel of a vehicle approaching
entry onto a public highway, said device including at least one
actuable display portion including courtesy indicia visible to an
operator of said approaching vehicle, means for sensing the
proximity of said vehicle irrespective of its headlight
illumination condition when at a point on said path in advance of
said display device and for activating said system in response
thereto, photosensitive means distinct from said proximity sensing
means disposed within an area of expected illumination by the
headlight beam of said vehicle when at said point, and control
means normally inhibiting actuation of said display portion and
responsive to illumination of said photosensitive means by said
headlight beam to enable actuation of said portion when said system
is activated in response to said proximity sensing means.
2. A display system as set forth in claim 1 wherein said display
device includes a warning display portion also including indicia
visible to said operator to apprise him of a non-illuminated
condition of the headlights of said approaching vehicle, and means
for activating said warning display portion in response to said
activation of said system when activation of said first named
portion is so inhibited.
3. A display system as set forth in claim 2 including means for
disabling control by said headlight beam sensing means.
4. A display system as set forth in claim 3 wherein said disabling
means is responsive to means for sensing ambient light conditions
in excess of a predetermined level.
5. A display system for motor vehicles comprising a display device
disposed adjacent to the path of travel of a vehicle approaching
entry onto a public highway, said device including at least one
actuable display portion including indicia visible to the operator
of said approaching vehicle to warn him of a non-illuminated
condition of the headlights of said approaching vehicle, means for
sensing the proximity of said vehicle irrespective of its headlight
illumination condition when at a point on said path in advance of
said display device and for activating said system in response
thereto, photosensitive means distinct from said proximity sensing
means disposed within an area of expected illumination by the
headlight beam of said vehicle when at said point in said path, and
control means operatively connected to said proximity sensing means
and to said photosensitive headlight sensing means and effective to
activate said portion upon coincidence of said proximity means
sensing presence of a vehicle and said photosensitive means sensing
absence of headlight illumination.
Description
BACKGROUND AND PURPOSE OF INVENTION
The subject matter of this invention finds primary application at
exits from service areas, such as filling stations or restaurants,
particularly where such areas are well illuminated. In exiting from
such areas onto a public highway, a motorist is likely to be
unaware of his inadvertant negligence in failing to turn on the
vehicle headlights because of the brightly illuminated conditions
of the area. The hazards of entry onto a public highway at night
with no lights is obvious. In such situations, it is desireable,
and is a purpose of this invention, to provide an indication to the
motorist that his lights are not on, and to provide a courtesy
message when the vehicle is determined to be departing with lights
properly activated.
PRIOR ART
It is well known to provide messages to motorists by means of an
activatable display which is controlled by means sensitive to
vehicle proximity and to a condition of the vehicle. In U.S. Pat.
No. 3,544,958 a display of this nature concerns itself with the
vehicle speed. Similarly traffic signals have been disclosed as
controlled by photoelectric sensors placed to sense vehicle
headlights (U.S. Pat. No. 1,939,436) and an illumination system in
U.S. Pat. No. 3,530,432 is described as sensitive to vehicle
proximity under conditions of low ambient light intensity.
DESCRIPTION OF INVENTION
Referring to the drawing, which is a combination perspective view
of a combination perspective view of the layout of the components
of the invention and schematic diagram an exemplary electrical
circuit thereof, the invention finds particular application at an
exit from a service area such as a filling station where the
service area 1 is well illuminated and vehicles are likely to
depart without a driver realizing that his headlights are off. A
vehicle 2 is illustrated as disposed along a path of travel
(departure) generally indicated at 3 leading to a highway,
generally indicated at 4.
Disposed adjacent to the path of travel 3 is a display device 5
comprising a first actuable display portion 6 and a second actuable
display portion 7. Each said portion includes appropriate indicia
thereon and separately actuable illumination means disposed
therebehind. The portion 6, which appropriately is colored red or
some warning color carries indicia warning a motorist that the
vehicle lights are not on, while the second portion includes a
courtesy message, such as "thank you" or "call again".
For energization of the display, a source of power 8 such as
conventional 115 volt 60 cycle house current is provided, and is
shown for diagramatic purposes only as being grounded at 9. The
"live" side of the source 8 is connected through line 10 to a
proximity relay coil 11, an ambient light relay coil 12, and
through contacts 21 of coil 11 to a headlight relay coil 13.
Energization of each said relay is controlled by completion of a
circuit to ground through its respective sensor. Thus, the
proximity relay coil is connected to a proximity sensor 14 disposed
at a point in the path of travel 3 which point is in advance of the
display device 5. This sensor may be of any type, preferably of the
magnetic type commonly used in traffic sensing. Ambient light relay
coil 12 is connected to a photoelectric ambient light sensor 15
which is disposed in a position removed from the artificial
illumination (not shown) of the service area, here indicated as a
high point on top of an advertising sign 16. The ambient light
sensor is oriented to sense only ambient light and thus determine
whether ambient conditions require use of automotive headlights. As
an alternative, a time clock could be substituted to activate relay
coil 12 (or corresponding switch contacts) during night hours only.
Headlight relay coil 13 is connected to a photoelectric sensor 17
disposed within an area of expected illumination by vehicle
headlight beams 18 when the vehicle is at the point of proximity
sensor 14.
OPERATION OF INVENTION
All relay contacts shown in their normal (non-actuated) condition
in which no vehicle is present. Thus, it can be seen that the
display remains inactive due to the normally open contact set 21 of
relay coil 11. Upon sensing of the proximity of a vehicle by sensor
14, relay coil 11 is energized to close contact set 21 and thus
activate the display panel 5 and enable relay coil 13. Should
daylight condition exist at this time, relay coil 12 remains
de-energized and contact arm 22 remains in contact with its lower
contact to complete a circuit through line 27 and thus actuate
display portion 7 to provide a courtesy message to the departing
driver. Alternately, of course, the said bottom contact could be
eliminated where operation of the display during daylight hours is
not desired. In either case, any control by relay 13 is disabled
when relay 12 remains de-energized.
If, on the other hand, sensor 15 determines that ambient light
conditions are of sufficiently low intensity as to warrant use of
vehicle headlights, appropriate circuitry completes its circuit to
ground thus energizing relay coil 12 and moving contact arm 22 to
engagement with its upper contact and enable control by contact arm
23 of relay 13. Assuming that the vehicle proximate to sensor 14
has its headlights on, this condition will be sensed by headlight
sensor 17 which operates in the opposite sense of sensor 15 and is
in open circuit condition when illuminated. Consequently, relay
coil 13 remains de-energized and the display actuating circuit is
completed through contact arm 23 and its lower contact to line 27
again activating portion 7 of the display to communicate a courtesy
message to the motorist.
Should the sensor 17 fail to detect the headlight beams of the
vehicle, a circuit is connected from relay coil 13 to ground thus
enabling the coil to activation by virtue of the other side of coil
13 being connected to the power source through proximity relay
contact 21. Relay coil 13 is energized to draw its contact arm 23
into contact with its upper contact thus completing a circuit to
line 26 to actuate portion 6 of the display to provide a warning to
the motorist that his lights are not on. This movement of contact
arm 23 simultaneous de-energizes line 27 and courtesy message
portion 7 of the display 5. It can be assumed that the motorist
will perceive the warning and will then turn on the headlights,
illuminating sensor 17 to de-energize relay 13. Contact arm 23 then
returns to its lower contact position to extinguish the warning
portion 6 and actuate the courtesy portion 7 of the display 5.
From the foregoing description it can be seen that a display system
is provided wherein a motorist is warned when about to enter a
highway without proper headlights. An examplary circuit has been
disclosed, it being clear that deviations therefrom utilizing
different circuit elements or connections to perform equivalent
functions are within the scope of the invention, which is to be
constructed in accordance with the following claims.
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